A Trilateral Filter for Video SAR Speckle Noise Reduction
Jiaqiu Ai, Gang Wang, Gaowei Fan, Feifan Wang, Lu Jia, Yanlan Wu, Enbing Hou · IEEE Geoscience and Remote Sensing Letters · 2022
This letter proposes a trilateral filtering algorithm for speckle reduction in video synthetic aperture radar (video SAR). The novel filter takes traditional bilateral filter as the basic framework, so as to fully exploit the similarities of gray levels and the spatial location of neighboring pixels. Moreover, the proposed trilateral filter additionally exploits the temporal correlation information among adjacent image frames of the SAR videos and effectively reduces the interference of redundant information by using an adaptive similar frame selection technology. Comprehensively considering the three-dimensional correlation information of spatial, temporal, and gray-scale, a triple-similarity kernel is specifically developed for video-SAR de-speckling. The proposed trilateral filter can effectively smooth the speckle noise while greatly sustain the details of each image frame of the SAR videos. Experiments show that the proposed algorithm has better de-speckling performance compared with other algorithms.